Belt-shifting mechanism.



G. H. KNIGHT.

BELT SIHFTING M0HANISM.

Arms/men FILED DEC. I6, 1916.

1,252,350; I Patented Jap.'1,1918. I IISEEETS-SHBETI- I G H. KNIGHT.BELT SHIFTING MECHANISM. APPLICATION FILEQ DEC-16.1916- I Patented J in.1, 19181 3 SHEETS-BEES! 2- G, H. KNIGHT. am smnms mzcmmsw 'APFL-ICATIONFILED DEC. l6. 19.

1,252,350. A I Patented Jan. 1,1918.

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CONNECTICUT, ASSIGN'OB TO THE HENDEY TOBBINGTON, CONNECTICUT, ACORPORATION.

BELT-SHIFTING MECHANISM.

Specification of Letters Patent.

Patented Jan. 1, 1918.

Application filed December 18, 1916. Serial No. 137,484.

To all whom it may concern:

Be it known that I, Gnonon H. Knron'r, a citizen of the United States,residing at Torrington, in the county of Litchfield and State ofConnecticut, have invented a new and'useful Im rovement in Belt-ShiftingMechanism; and I do herebydeclare the following, when taken inconnection with the accom anying drawings and the characters of reerence marked thereon, to be a full,

exact description of the same, and which said drawings constitute partof this application, and represent, in-- Figure 1 a broken view 1n of myimproved belthifting mechamsm, the tubular shaft employed to connect theupper and lower units of the mechanism beingi centrally broken away.

ig. 2 a corresponding view in side eleyation.

Fig. 3 asectional view on the line H of Fig 1, looking upward.

ig. 4 a sectional view on of Fig. 1, looking downward.

Fig. 5 a broken view correspondln to Fig. 3, showing the canting of thebelt-s fting lever of the u per unit of the mechanism turn of the orating-handle in shifting the belt for re ucing the speed.

Fig. 6 a broken view eorres ending to Fig. 4, and showing thebelt-shifting lever of the lowerunit of the mechamsm canted as theresult of the/first turn of the operating handle in shifting F ig. 7 a.detached plan view of the bevel er of the lower unit of the mechanism.My invention relates to an improved beltshiftin mechanism for use in.comunctron with apers, lathes, drills, boring mills,

wood-working machinery, et cetera, the obcompact and the line 44reliable ular reference to quickness and ease of operation and thereduction of belt-wear to the m nimum. a

With-these ends .in view, my invention consists in a belt-shiftingmechanism char-v acteri'md by provision for positively twistsw ngoutward; with respect to the cone presax-story to shifting it, andhaving of motion and front elevation rying the belt for reducing theechamsm constructed with partictent oscillation parts as will behereinafter described and pointed out in the claims.

In carrying out my invention as herein shown, I employ an inclined oeratinghandle 5 pinned to the outer end of a short shaft 6 journaled inan inclined arm 7 formed integral with, and offsetting from a globulargear-case 8 formed with a tubular standard 9 made integral with theupper face of a sliding carrier 10 mounted upon the camplate 11. of thelower unit of the mechanism. As shown, the edges of the said plate arebeveled for the retention of the carrier in place as the same slidesback and forth upon the late.

T e inner end of the shaft 6 is furnished with a bevel pinion 12 meshinginto a bevel gear,13 located within the gear-case 8 and fixed upon theupper end 14 extendin downward through the said tubular stan ard 9,

and at its lower end cara rack pinion 15 meshing into a rack 16 securedto the under face of the said camplate 11 which is positioned so as tofollow the tapering outline of the stepped lower cone which, as shown,has four steps 17, 1.8, 19 and 20. The said stepped cone is locatedwithin a tapering cone-casing 21 secured. to the machine-frame 22. Thecone itself is mounted upon a driven shaft 23. A bracket 24 applied tothe outer or smaller end of the cone-casing 21, "is employed forsupporting the outer end of the cam-plate 11 the inner of a verticalshaft end of which is supported upon the conecase cover 25. g

The sliding-carrier 10 aforesaid, has 'piv-' otally mounted upon itsupper face, a' beltshifting lever 26 swinging upon a stud 27 andfurnished at its outer end withan eye 28 through which thepoweiigtransmission belt 29 passes. At itsinner end, the said lever 26has an arm 30 carrying a roller. 31 running in a symmetrical zigzagcam-slot or pathway 32 havin five bonds to produce three oscillations othe lever 26, or one less oscillation than there are steps onthe o'one..

The combined longitudinal movement f the sliding carrier 10 on thecam-plate 11, and.

the tra 10f the r011er31 in the zigzag-cam ment of the belt-shiftinglever 26, whereby the belt 29 is alternately twisted with respect to thesteps, of-the cone, and moved in ine pathway 32, results in the.intermitand direct or linear move therewith, as will be more fullydescribed in due course. a

The said bevel gear 13 has an upwardly extending hollow hub 33 formedwith oppo- 6 sitely located slots 34-, (Fig. receiving the projectingends of a coupling-pin 35 passing transversely through the rounded-head36 of a universal-joint piece 37 secured by a pin 38 to the lower end ofa tubularshaft 39, the upper end of which is connected with the upperunit of the mechanism, the said upper unit substantially duplicating thelower unit already described, but having the steps of its cone reversedin direction.

A corresponding universal-joint piece 40 is secured by 'a pin l1 to theupper end of the saidshaft 39, the rounded head 42 of the saidjoint-piece being entered intofthe depending hollow hub 4.3 of arack-pinion 44 2 Q corresponding to the pinion 15 already described, thesaid hub 43 being formed with oppositely located slots 45 for thereception of the projecting ends of a coupling-pin 46 passing throughthe rounded head 42 ofthe said universal-joint piece40.

The pinion 4-1 is mounted upon the lower end of a short ver tical shaft47 jou-rnaled in a boss 48 formed integral with the uniper face of asliding-carrier 49 mounted u on i 80 the upper cam-plate 50 whichcorresponds in construction, arrangen'ient and junction to the lowercam-plate 11 already described. The said cam-plate 50 is. secured at itsends to brackets Hand 52 mounted upon a rod '53 supported at its ends ina pair ofarms 54 adjuslably secured by bolts passing through segmental.slots 56, to the lower ends of COIJIXtQIFShaflL hangers 57 carrying acounter-shaft 58 upon which the upper or driving cone is mounted, thesaid upper cone having four steps 59, 6 0, 61 and 62 corresponding tothe steps 20, 19, 18 and 17, but reversed in arrangement.

secured to the under face of the said camplate vhich is formed with asymmetrical ,Zigza'g cain-slot or pathiay 64 correspondingto the zigzagcam-slot or pathway32 in the plate '11,- and receiving a roller 65'carried by the armffi i oiia belt-shifting lever ,(37 mounted'upon theupper face of the sliding carrier 49 so as to swing upon a stud 68, theouter end of the said lever (S'T 'being furnished with aireye (39through which the belt 29 passes. T'he sliding of the carrier 4!) overthe emu-plate 50 and the travel of the 1 roller 65 in the cam slot'44,results in the Y same ca'nting and direct bodily movement of the lever6-? with-respect to the'bclt 29, as. i0.already;described, forTthe lever,26 of the lower-unit of-the mechanism. 1

lavi'ng now described my improved mechanisn i in detail, I will vsetforth the mode of its iopcration. f 86 lnfthe drawings themechanism-is-sliown and 19 of the respective "cones; has now been shfted'. one step on each'fcone of the belt onestep allft :Inatterofgearing and having"nothingrtodo as shifted tor s ecuri'iig maximum"speed I of the driven shaft 23, with the belt 29 running over thestep20 the lower cone, and

the step 62-'-,of thel'upper 'cQneflIf now the operating handle 25'isturned clockwise, (from left to right) one complete turn, thesliding-carriers'1Dv and 14 will be simultaneouslymoved to the sameextent; upon their respectivecam-plates 11 and 50, into the positionsshown in Figs." 6 and 5 respectively, with the effect of c'anting' thebelt-shifting lever 67 inwardso as to strip the belt 29 "froni the step:62: the upper'eone' and drop it off ontothe adjacentgstep 61 thereof,

whereby the belt is loosened. fAt the same 80 time thebelt-slii'ftinglever'26 i's can t'ed outwardlywith the effect of "twisting the belt 29so as to'spring its'inner edge away from the step 20 of the lower cone'and outward with respectto the periphery of the step 19 of the. saidcone. v I I The turning of the'hfandle' 5 is continued until itcompletes a'fsecofnd revolution during which the slides 49 andare'siinultaneously n'i'oved fart-her inward with the effeet ofrestoring the said' l evers ftfl and 26 into the positions in which'theyare" shown in I igs. and 4 W ththe exception that they will now belocatediopposite the'fstepsffil Tli' belt in the direction of r educedspe'ed. To further'reducethe speed oflth' driven s'hafti- 23,

the operating-handle 5 is giyeatwo qr rnore complete turns, whereby thebelt is'shifted at the'topfland twisted shifted at tli ebottom in themanner already descr'i'bed,aft'er which the belt willbe left ru ning onthe steps 60 and, 18 of thefeones. 'ffllwo more completeturns of thehandle 5;will infthe same manner shift the belt to runio'verthe steps 59and-17 of thetwo' bones, "whereby the shaft 2 3-wil1" "be-"driven at itslowest The said pinion tlmehes into a rack 63 y peed-i some inei'esef'the, spe dier-the stanza; 1 0 i the handle 5'*-1s' given; two ooinpleteturns counter-clockwise, (left to right), whereby the belt will beshi ftedj otltward" from' the clockwisc i the mechani'snishifts" thelower "end ofIthebelt'and twists and shifts the up pr-iend of the beltjwhich is' -just the-reverse oil \vhat fhap'p len's in re'ducing' thespeed The mechanism" can readily be geared-s0 as torequire but onerevolutionbf-tlie'fhandle jt'or completing the shifting the Belt; one

step or on thelotlle 19nd,; incge of a very 25 heavyibeltythe meclmsitican be geared-so thatit will requiretln" four -morfe' evouti one ofj the" handle t effect the sh fting s being merely a i I l with myfundamental principle. It will be noted that under my invention, thebeltshiitting mechanism is selfoontained and positively twists the beltso as to cause its advancing edge to swing outward with respect to thesteps of the cones without utilizing them as points of purchase for theadj acent edge of the belt which is mechanically, and thus positivelytwisted without help from the cones themselves.

It will be seen from the foregoing that my improved mechanism providesfor positively twisting the belt to cause its advancing edge to swingoutward with respect to the cone before shifting it onto a step oflarger diameter, whereby the power necessary to shift the belt isgreatly reduced, and the life of the belt prolonged, since when the belthas been twisted, it is ver easily guided from one step to a step 0larger diameter. The mechanism will be constructed so that the twistproduced in the belt will always take place where it runs onto the stepsof the cones rather than where it leaves the steps.

I would have it understood that I do not limit myself to the particularconstruction shown and described, since various instrumentalities mightbe employed for positively twisting the belt to cause its advancoutwardwith respect to ing edge to swing t e operation of shifting it.

the cone during Thus, other means than those shownmlght be employed foroperating the sliding-carr riers, and the mechanism might be arranged tohave the shifting on the overhead cone precede, to some extent, thetwisting of the belt on the lower-cone, or vice versa. The shifting andtwisting of the belt need not be simultaneousfthough the twisting of thebelt must precede the final shifting.

I claim 1. In a belt-shifter, the combination with two stepped cones forthe reception of a power-transmission belt, of two self-c0ntainedbeltshifting mechanisms respectively located adjacent to the said conesand each mechanism bein constructed and arranged to positively twistthat portion of the belt adjacent to the complementary cone, without aidtherefrom, to cause the advancing edge of such portion of the belt toswing outward with respect to the cone'preparatory to shifting thetwisted portion of the belt from a cone-step of smaller to one of largerdiameter.

In a belt shifter, the combination with two stepped cones for thereception of apowcr-transmission belt, of two sliding carriers,belt-shifting levers pivotally. mountedthereupon, means forsimultaneously moving r Jenn Jscits.

the sail-carriers, and means co-acting with riers, belt-shifting "thesaid levers for imparting swinging movement to them for positivelytwisting the belt to cause its advancin edge to swing outward withrespect to t e cones without.

outward with respect to the cone prior to shiftin it from cone-steps ofsmaller to larger liameter.

4. In a belt-shifting mechanism, the combination with two stepped conesfor the reception of a power-transmission belt, of sliding-carriers,means for simultaneously moving the same, belt-shifting levers pivotallymounted upon the said carriers, and zigzag cams co-acting. with the saidlevers to cant the same with respect to the cones for positivelytwisting the belt to cause its advancing edge to swing outward withrespect to the cone before shifting it from conesteps of smaller tolarger diameter.

In a belt-shifting mechanism the com.- bination with two stepped conesor the reception of a power-transmission belt, of sliding-carriers,means for simultaneously moving the said carriers, shifting-leverspivotally mounted upon the same, andcamplates arranged in line with theprofiles of the stepped cones and containing cam-paths co-acting withthe said levers for canting .the same to positively twist the belt tocause as i co-acting with t c said levers for swinging them to effectthe positive twisting of the belt without aid from the cones tocause itsadvancing edge to swing outward with re-' spect to the cones. i

In testimony whereof, I have signed this specification in the presenceof twq subscribing witnesses.

GEORGE KNIGHT Witnesses CHAS. H. ALVORD,

